A method to determine the electroweak mixing angle from Z decays to tau leptons using optimal observables

We propose a new method to measure the electroweak mixing angle in Z decays to tau leptons. For various tau decay channels optimal observables are constructed which yield the largest possible signal-to-noise ratio. These optimal observables are derived from the full spin-density-matrix of the process including correlations between tau spins and an approximation to the tau flight direction. (orig.)24 refs.SIGLEAvailable from TIB Hannover: RN 5063(97-05) / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekBundesministerium fuer Bildung, Wissenschaft, Forschung und Technologie, Bonn (Germany)DEGerman